How Little We Know

You can obtain this quest from many NPC's. Just after you enter the Casino, you will be asked to give away your weapons, although you can keep hidden one. Go to the receptionist (M7F:1) #1 and try to get any information about Omertas plans [Speech 28]. You can also use the [Terrifying Presence] perk on one of the Omertas thugs and find out where Cachino is. You can find him sitting by the table (M7F:2) or (most probably) he will catch you when you head towards him #2.

After asking him about dodgy business, Cachino will leave. You need to get some proof that something is wrong. To do so you can try:

sneak behind him #1 and pickpocket the Cachino's Journal out of his pocket;

talk to the receptionist and locate Cachino's bedroom.

If you choose second option you have to pay her 300 caps for the key or use [Strength 8] to get the key free of charge or lower the bribe to 200 caps with [Barter 55]. Take the elevator (M7F:3), head to [Gomorrah Rooms] and then step into Cachino's rooms. Pass behind the guard and open the door using the [Lockpick 75]. Search the desk to the left #2 and you'll find the Cachino's Journal.

Return to Cachino (M7F:2) and show him the journal. Now you can choose one of two ways to complete this task:

[Barter 60] demand 200 caps for the journal

demand 100 caps for the journal

keep the journal

If you give Cachino the journal back, you can help him to thwart the Family plans - solution 1. And if you decide to keep the journal, scroll down to the solution 2.

Solution 1

Side with Cachino and help him to thwart the Family plans. You have to get some information from Troike about mysterious weapon supplies or get to know what Clanden is into. You'll receive the Zoara Club key.

TROIKE

Go to the elevator leading to the [Gomorrah Lower Level] (M7F:3). When you're downstairs, open a door (M7G:1) with a key and head to the room where you'll find Troike (M7G:2) #1. Ask him about weapons - he won't be very helpful:

suggest that you can try to free him of his contract with the Family

[Speech 80] intimidate him with NCR

[Medicine 30] ask him about the hooker

Return to the lower level and take the door (M7F:4) to a balcony, where you can find Big Sal (M7F:5) #2.

[Barter 45] lie to him and tell him, that Troike will try to have better prices

[Speech 53] tell him that there will be only problems with Troike

buy his contract for 300 caps

You can also find a Troike blackmail note in Big Sal's office safe. You can get the password from the boss by stealing it, open the safe by yourself or hack the terminal to open it.

Return to Troike (M7G:2) and tell him that he is free of his contract. Ask about guns:

[Speech 70] force Troike to destroy guns

destroy guns by yourself.

In the first case leave the casino and come back. If you choose the second option, go to the basement (M7G:3) and plant the Thermite (M7G:4). You can also search boxes first and take weapons you find. Return to Cachino (M7F:2) and report to him. The ending begins.

CLANDEN

You will find him in his room but basically he will not give you any clues. However you can find a safe behind the wardrobe #1 [Lockpick 75], which contains Snuff Tapes. You can now talk to Clanden or to Cachino (he'll tell you to talk to Clanden anyway):

[Barter 50] blackmail him - you'll get 200 caps and force Clanden to leave the town

give him the tapes back and force him to leave the town

tell him that you keep the tapes and kill him.

ENDING

Both, you and Cachino will meet the bosses. [Speech 80] coax Cachino to start the shooting - the bosses shouldn't expect that. Follow him to the room. You'll get a gun - sit down on a coach and start a conversation. [Speech 80] you can ask about the plan and then lie that Nero asked you to kill Big Sal. The shooting will start soon - kill Nero. You can also give a signal to Cachino anytime to shoot one of the bosses. The task is over.

Solution 2

You decide to keep the journal - go to a balcony, where you can find Big Sal (or Nero) (M7F:5) #1. There is a guard right to the door (M7F:4).

[Speech 50] say that you want to talk about Cachino;

show him the journal;

Tell the bosses that one of their employees cheats them.

sell it for 100 caps

[Barter 55] sell it for 200 caps

Go after the boss to his office #2 where he will deal with Cachino.

Ask the boss what to do next. You have to help two Family members - Troike and Clanden.

TROIKE

Go to the elevator leading to the [Gomorrah Lower Level] (M7F:3). When you're downstairs, open a door (M7G:1) with a key and head to the room where you'll find Troike (M7G:2) #1. Ask him what he needs - you have to help him to find a missing shipment of weapons. Leave the casino and head to [Sunset Sarsaparilla Headquarters] (MsB:18). You'll find a weapons shipment north west of the Sunset Sarsaparilla Headquarters (M10:1) #2. Watch for the Fiends guarding it. Take the shipment and return to Troike (M7G:2).

CLANDEN

You will find him in his room #1. Ask him what does he need - [Science 60] you can guess by yourself or just ask him directly. It is about chlorine. You can get it in one of two places - in the Ultra-Luxe Casino or in Freeside.

Go to the [Ultra-Luxe Casino] (M7:4), give away (or holdout) you weapons and head to closed storage room at the end (M7C:6). To open it you need [Lockpick 25]. Take the Container of chlorine#2 and return to Clanden.

You can also visit [Mick and Ralph's] (M6B:2) and buy chlorine there [Science 60] or you can convince the trader [Barter 50] to sell it for a half price. Return to Clanden.

Return to the boss to finish this task.

Implications

If you haven't complete the task, the Omertas will attack you during the final battle at Hoover Dam, however they won't use the bomb.

If you have sided with the bosses, the Omertas will attack you during the final battle at Hoover Dam and they will use the bomb.

If you've helped Cachino, the Omertas won't attack you during the final battle at Hoover Dam.